an "armageddon" spell that kills everything on the screen would't give anyone enjoyment.
In an old Nintendo console game (maybe Ultima?), there was a hard to find skull which could be used to destroy everything onscreen. Used in a town it would wreck the place, kill everyone, and
really hurt your reputation (some kind of virtue system IIRC); used in battle it would kill all your opponents and end the fight, without any loss of reputation. I found that quit enjoyable for a few minutes; I would have gotten board with it, had I not first noticed I wasn't getting any experience points. The skull still came in very handy, though. If I was trying to get somewhere, and hit a random battle with a bunch of weak opponents that were not going to give much experience anyway, I could use the skull to quickly end the fight.
